103 lines
2.9 KiB
Python
103 lines
2.9 KiB
Python
"""
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Resource list for mucking with DPIs on multiple screens:
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- https://stackoverflow.com/questions/42141354/convert-pixel-size-to-point-size-for-fonts-on-multiple-platforms
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- https://stackoverflow.com/questions/25761556/qt5-font-rendering-different-on-various-platforms/25929628#25929628
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- https://doc.qt.io/qt-5/highdpi.html
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- https://stackoverflow.com/questions/20464814/changing-dpi-scaling-size-of-display-make-qt-applications-font-size-get-rendere
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- https://stackoverflow.com/a/20465247
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- https://doc.qt.io/archives/qt-4.8/qfontmetrics.html#width
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- https://forum.qt.io/topic/54136/how-do-i-get-the-qscreen-my-widget-is-on-qapplication-desktop-screen-returns-a-qwidget-and-qobject_cast-qscreen-returns-null/3
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- https://forum.qt.io/topic/43625/point-sizes-are-they-reliable/4
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- https://stackoverflow.com/questions/16561879/what-is-the-difference-between-logicaldpix-and-physicaldpix-in-qt
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- https://doc.qt.io/qt-5/qguiapplication.html#screenAt
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"""
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from pyqtgraph import QtGui
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from PyQt5.QtCore import (
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Qt, QCoreApplication
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)
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# Proper high DPI scaling is available in Qt >= 5.6.0. This attibute
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# must be set before creating the application
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if hasattr(Qt, 'AA_EnableHighDpiScaling'):
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QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
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if hasattr(Qt, 'AA_UseHighDpiPixmaps'):
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QCoreApplication.setAttribute(Qt.AA_UseHighDpiPixmaps, True)
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app = QtGui.QApplication([])
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window = QtGui.QMainWindow()
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main_widget = QtGui.QWidget()
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window.setCentralWidget(main_widget)
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window.show()
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pxr = main_widget.devicePixelRatioF()
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# screen_num = app.desktop().screenNumber()
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# screen = app.screens()[screen_num]
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screen = app.screenAt(main_widget.geometry().center())
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name = screen.name()
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size = screen.size()
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geo = screen.availableGeometry()
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phydpi = screen.physicalDotsPerInch()
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logdpi = screen.logicalDotsPerInch()
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print(
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# f'screen number: {screen_num}\n',
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f'screen name: {name}\n'
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f'screen size: {size}\n'
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f'screen geometry: {geo}\n\n'
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f'devicePixelRationF(): {pxr}\n'
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f'physical dpi: {phydpi}\n'
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f'logical dpi: {logdpi}\n'
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)
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print('-'*50)
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screen = app.primaryScreen()
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name = screen.name()
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size = screen.size()
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geo = screen.availableGeometry()
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phydpi = screen.physicalDotsPerInch()
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logdpi = screen.logicalDotsPerInch()
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print(
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# f'screen number: {screen_num}\n',
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f'screen name: {name}\n'
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f'screen size: {size}\n'
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f'screen geometry: {geo}\n\n'
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f'devicePixelRationF(): {pxr}\n'
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f'physical dpi: {phydpi}\n'
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f'logical dpi: {logdpi}\n'
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)
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# app-wide font
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font = QtGui.QFont("Hack")
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# use pixel size to be cross-resolution compatible?
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font.setPixelSize(6)
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fm = QtGui.QFontMetrics(font)
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fontdpi = fm.fontDpi()
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font_h = fm.height()
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string = '10000'
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str_br = fm.boundingRect(string)
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str_w = str_br.width()
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print(
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# f'screen number: {screen_num}\n',
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f'font dpi: {fontdpi}\n'
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f'font height: {font_h}\n'
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f'string bounding rect: {str_br}\n'
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f'string width : {str_w}\n'
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)
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